Start with conditions, not a product
How flashing handles a Piedmont thunderstorm, how the sill sits against clay soil movement, and how the frame meets existing trim matter more than the unit itself.
Build a complete scope
- Which era the house belongs to, since it changes the recommendation
- Whether original sash in the mill-era core is worth repairing
- Openings measured individually rather than assumed standard
- Glazing for solar gain and how the opening is flashed against driven rain
- Trim restoration inside and out, disposal, and the warranty terms
Concord context
Which housing category a Concord house belongs to decides this job. In the historic mill-and-rail core, original wood sash is frequently repairable and openings are rarely standard sizes, so an assessment before replacement is quoted can change the recommendation entirely -- and in the oldest of that stock, paint layers may be lead-bearing, which affects how the work may be done. Postwar neighborhoods generally carry aluminum or early insulated units now well past their service life, where the frame's thermal performance is the weak point rather than the glass. The newest subdivisions are a maintenance question rather than a replacement one. What the local climate contributes is modest but real: humid Carolina summers make solar heat gain and the air sealing at the installation more consequential than insulating value, and intense summer rain tests the flashing at every exposed opening.